Automatic pressure-controlling valve for hydraulic presses.



W. P. BETTENDORF, DEGD.

J. W. BBTTEHDOBF, ADMINISTRATOR. AUTOMATIC PRESSURE UUNTRULLING VALVEEUR HYDRAULIC PRESSES. APPLIUATIOFILBD JAN. 3, 1910.

1,046,949. Patented Dec. 10,1912.

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\ ASME-AAR OLII-TIER umm fg lum" A Emil kx j' W. P. BETTENDORF, DECW.

J. W. BETTENDORP, ADMINISTRATOR.

AUTOMATIC PRESSURE GONTROLLING VALVE P0P. HYDRAULIG fmsss.

APPLICATION FILD JAN. 3, 1916.

Patented. Dec. 10, i912.

il SHEETS-SHEET 2.

W. P. BETTENDORF, DEC.

J. w. BBTTBNDORP, ADMINISTRATOR.

AUTOMATIU PRESSURE CONTROLLING VALVE POR HYDRAULIC PRESSES.

APPLICATION FILED JAN. 3, 1910.

1,046,949D Patented Dec. 10, 1912. v

3 SHEETS-SHEET 3.

l sol i To all 'whom t may conc-em:

^ UNITED STATES PATENT oEEIoE.

WILLIAM P. BETTENDORF, or' BETTENDORF, IOWA; J. W. BETTED'ORFADMINISTRATDE or SAID WILLIAM 1 BETTEND0RF, nEcEAsED.

AUTOMAT-IC PRESSURE-CONTROLLING ALvE FOR HYDRAULIC PRESSES.

' specification of Letters Patent. Patented Dee. 10, 1912.

Application med January a, 191'0; seria1`n'o.5a6,o43.

Be it known that I, WILLIAM vBian'rrEN- D oRF, a lcitizen of the UnitedStates, residing at-'Bettendorlh in the county of -Scott and State ofIowa, have invented new and useful Improvements in AutomaticPressure-Con# mercial -forms of iron -or steel, in. which a pressure oftwo thousand five hundred tons- -to the square inch is sometimesdeveloped;

The principal considerations for presses of this kind are, first thepressure'to be exerted by the ram, and, second, the extent of ltstravel, and heretofore the 4size or propor-I tions; .dif the ram-and itscylinder depended upon these considerations. That is to say, 1f it wasdesired to exert a working pressure of 1500 tons, with a service waterpressure of 350 pounds tothe squareinch in the'simple type of hydraulicpresses, the cylinder" and ram would necessarily have to be over eightfeet in diameter. This same working pressure of 1500 couldbeobtainedwith a service water pressure of 1000 pounds per square inch,with a ram of 'five feet in diameter, and with a service pressure of3000. pounds per square inch with a ram three feet in d1- ameter.impracticable, and the tremendous pressure of three thousand pounds persquare inch 1s prohibitively expensive.

' The object of my invention is to enable the comparatively small ram,while traveling to cr from the work to be actuated by a very low servicepressure, and then when the.-

high pressure is needed, to'automatically in-A crease the intensity ofthe'service pressure one, two, or more stages successively as needed.This I. accomplish by comparatively simple means, and at a very small expenditure of liquid, substantially as hereinafter fully described, andas particularly pointed ou-tin the claims.

`In the drawings:-Figure lis a longitudinal horizontal central sectionof a hydraulic pressure controlling valve embodying my invention. Fig. 2is a side elevation .of the same. Figs. 3 andA 4 are views, show- Aneight foot ram is physically p sisting of -a boltthreaded at bothA ends,and

" ing p istony c Asuitabl short cylinder d, and is valve, Fig. 5-is asection taken on dotted line 5,l 5, of the inlet valve ofthe low servicepressure pipe. Fig. 6 is a detail View showing the valve seat therein inlongitudinal central section. I f

My improved valve is suitably attached to and located betweenthe pressand the source of liquid supply, to which latter it'is connected bythree distinct and independent water pipes or service lines. Oneof-these pipes constitutesthe low pressure line, sup-- plymgpwater at,say, 350 pounds tothe square inch; the next supplies the water at apressure of 1000 pounds to the square inch', and the third suppliespressure atA 3000 pounds. The valve, asshown in the drawings, comprisesa suitable casing, the principal partof which consists of alongitudinally disposed cyllndrical body, A, in which the sliding-lvalve for the press has reciprocal play. .At

` one end of this body means are' provided for' moving thesliding-valve; at the opposite end, a suitable head B with' theexhaust-L pipe, C, leading therefrom is connected thereto, at about itscenter of length the feed-pipe D is -suitably secured thereto andextends laterally therefrom, in a plane preferably, at right angles ltopipe C, and dia: g l-metrically opposite the said feed-pipe, and threeservicelines -have valve-controlled conjnectiong'with said body.

The sliding valve comprises a corel a conthe end thereot opposite theexhaust-pipe fromA which it is prevented froml accidentally ing themouth of the bore and compressing a suitable packing ring b3 int.place.`The outerend of block b has the end of an alinsaid piston' enters arovided therein ylinder d isntthe opposite end o with a suitable head c.

tached to and held out from-the adjacent 105 'C is tapped centrally intoa head-block, b,

' unscrewing by a transverse pin b passing'- through both parts. Thisblock ts snugly in the adjacent endof the bore of body A.,

and the sliding engagement thereof is made' "watertight byan annularplate b2, surroundend of the cylindrical bodyl of the casing by asuitable arrangement of bolts, and when compressed air or water underpressure ia 10o secured therein, and

allowed to enter the same through pert d back of the piston-head and,.exhausts -through port (Z2, the valve will move'toward said cylinderand open the low pressure service-pipe and Vice "versa. The core-bolt ofthe valve is of such length that, when ,the low pressure Vservice-pipeis closed, it extends to the opppsite end of the exhausthead of thecaslng, and, between block b and the exhaust-headlitis surrounded bysleeve e of less diameterthanthe bore of the body, except the endthereof next said block,..whiol 1- is expanded, and a suitable packing'ring e" -is interposed between it and said block. This sleeveis held iplace by lock-nuts f, between which and he adjacent end of the sleeve, acup-shaped valvehead F surrounds ,and is 'secured by said nuts on thebolt-core. The diameter of this valve-head is suchA that it .has a snugsliding engagement with the bore of thebody yA,

' but the interiordimensions of the exhaust pipe head are greaterandleave an'annular 4 25 v f rounds the adjacent end/ ,of the sleeve e,

space around the valve-head, The skirtof the valve-head extends Vbackover and surand the inner'surface rof its skirt portion is of suchdiameter that there is room for the water to enter betweenv the` sameandthe core, and 'when the. valveis atithe end'of its movementtoward'the exhaust pipe, flow lradiallyl out through slots g made-insaid skirt intov the yexhaust-head andfrom thence supply of water fromthe low pressure service-pipe. This low pressure service-pipe 4 entersthe lower end of said housing and oth the lower end thereofv surroundingsaid pipe and the .upper o en end ofthe same are closed by suitable' pates clamped togetherby bolts and made vwatertightI by suitablepacking.' Within housing'` 3 immediately 'above the end oftheserv1cepipe4, a combined valve-seat andcage 5 is secured. This ca e,as shown in Fig. 5 of the drawings, is

cy lndrical and of alength butlittle less` in heightv than theA housing,in which'it is 'held in place' by the downward ressure upon its upperend of a'plate 6. screw '.7 Lis tapped through the top-plate of thehousing and bears down upon plate 6. The lower end of cage 5 is madethicker and is rovided with an inner beveled valve-seat 8,

I. or the puppet-valve 9, and above thep'lane of this seatsaid cagek isprovided with a circumferentlalseries of longitudinally elongated slots10, which-are adapted to cornmunicate with a widened interior portion ofthe housing, and near its up er end it is provided with a circumferentialy. arranged series of perforations l2. The puppet-valve is normally.keptseated'by 'an inverted helical coil-spring 13,v the ends of `whichare g centered bysuitable rotuberances .On the opposing faces of saivalve and plate 6,

Now when the sliding-valve has been 4moved toward .cylinder dsuiiiciently to close the outlet slots g in the valve-head- F, block bwill have uncovered the ports `14, 14, connecting the annular chamber 2with the interior of the slidingvalve chamber of the case, and the lowpressure'water, say at 35() pounds pressure to the square inch, willflow around sleeve e and into the'feed-pipe D leading to the press, andwill continue to move .the ram thereof until the'- resistance theretoequals the working force created by -the pressure 'of the water. Whenthis point is reached the water, which will have filled the inlet'ports15 and 16 of the intermediate pressure 'service-lines and the highpressure lines, will automatically operate the valve -mechanism of theintermediate service-line, and after its' pressure of say 1,000 poundsto the square inch has been expended in operating the ram, willautomatically operate the valve mechanism of the high pressure serviceline, and open it.

The construction of the valve-mechanism controlling t-heJ inlet of waterfrom both the intermediate pressure service-line and the high pressure.service-line is the same, so the description of theone will serve as adescription for both. The inlet-ports 15 and 16, are increased .india-meter a short distance from the cy- .lindrical body A in metalbosses integral .with the same, 'and the openings of which said portsare a part, are step )ed to a greaterdiameter to receive stubs 1lforming the casing for said valve-mechanlsm. The end portionsof the boreof said stubs 1'?,` are greater in diameter than the intermediateportion 18, which latter is just large enough to form a uidefor'a hollow plston 19. The end of this hollow-plston nearest -body A, has asmall puppet-valve 20, which is confined b a hood 21 that has lateralperfora'tions- 1n its sides that connect the hollow chamberthereinIinY-which said valve has a limited play with 'the port. Betweensaidhood and the contracted portion 18 of the stub, a suitableiston-head surrounds and is secured to sai piston 19, which' engages thewalls of the widened portionof the adjacent end of the bore of saidstub. .The mouth of the contrnctedportion of the bore of said stubfarthest from the body A, is counter-sunk and forms a seat forthecorrespondingly shaped head 23 of the valve 24, the spindle 25 of whichextendsin alinement with the hollowpiston 19, out through a packedopening in the plate 36 closing the outer end of the bore of the stub.The end of the said hollow piston farthest from said body is providedwith lateral notches or openings, 26, and said end normally bearsIaglainst the head 23 of the valve 24, and W en the pressure of the waterin th/e body (as, for instance, when 'the resistance to the Waterpressure from the low service pipe, is greater than said pressure) issufliclent to move the hllow piston, 19, out-ward, the valve 24` movesoutward until .the notches 26 can communicate with the inlet chamber 27made by the widened bore of the outer end portion ofthe stub. `The pipe28 of the intermediate pressure service line is suitably connected toand leads from chamber27, and when the bore' of the hollow-piston 19,communicates through notches 26, with said chamber t-he intermediatepressure water flows through the hollow piston, lifts puppet-valve 20,and flows out through the perthrough port 15.

foratio'ns of hood 21, in to the valve casing The resistance to themovement of the hollow-piston which determines what the amountof outwardpressure in the'body' A of the casing shall be before said hollow-pistonmoves outward is determined by the difference in area of the outerexposed surface, and the under exposed surface of the truncated 4head 23of valve 24.v `The water fromthe pipe of the intermediate pressure service hne, 28, continually exerts a pressure of 1000 pounds tothe squareinch, againstthe underside of the valve-head 23, used in connectiontherewith, and the Water from the pipe ofthe high pressure service-lineA37 continually exerts a pressure of 3000 pounds to the ,square inchagainst ythe underside ofthe valve 23 used in conjunction t ere'with.

v Now the area of the outer expose surface of the hood 21, in the port15 of the intermediate pressure service-line, is enou h I 45 greaterthan the exposed surface of t e yunderside of the valve-head 23 of thecoacting-valve 24., that, when the press ram ceases to move under theinfluence of the 350 pound's'pressure of water .from the low pressureservice-line, said pressure will automatically overcom'e the 1000 poundspressure from the intermediate pressure serv-ice line, and depress valve24, and permit the waterat 1000 pounds'pressure to enter thevalve-chamber in body A. So', likewise,

whenl the -press-ram ceases to move under 'theinuence of the pressuresupplied from the intermediate pressure service line, the

. area of the hood 21 in the port 16 of the high pressure lservice line,being greater than the underside'of the valvefhead 23 ofvalve 24,-coperating therewith, the 1000' pounds water pressure to the squareinch within the A, overcomes the' valve-chamber of bod 3000 poundssquareinc pressure under said l successively valve-headvv and opens thepassage of water to said body'A, from the high pressure service line. .f

Vhen thevalve 24 is moved outward by the water pressure within the valvechamber its movementv is resisted by a coil expansion spring 29, theends of which are seated in suitably shaped caps. One of these caps, 30,is engaged by the outer end of the spindle 25 of valve 24, and theother, 31, of which is engaged by a set-screw or bolt 32 which is tappedthrough the central boss of a yol e 33, in alinement with the axis ofsaid spring, said valve 24, and said hollow-piston By manipulating saidbolt 32, the proper cushioning of the valve 24 to automatically reseatthe same/when the pressure is cut off, can be obtained to aI nicety.

The valve-mechanism for controlling the opening of the high-pressureservice line, 37,

1s, as hereinbefore just describedf The ends of the yokes, 33, -areconnected to or made inte-gral with the plate 36, closing lthe outerends of the bores of the valve stubs 17, but the construction of thiselestated, the same as that ment, aswellas that of other parts of myinvention may be changed if desired, so long as such departuredoes notaffect the operation of my invention.

What I claim as new is 1. An automaticpressure controlling valvecomprisinga single `longitudinally rev ciprocable valve, 'and casingtherefor having a main chamber within which said valve reciprocates, anexhaust pipe leading from said chamber and adapted tov be opened andclosed bysaid valve', an open feed pipe leading from said chamber, andaseries of separate pressure. service pipes that discharge directly intosaid chamber, and separate valves for said pipes that are adapoted'to beautomatically opened y the pressure of the precedlng pressure service.p1pe. Y

2. An automatic pressure controllingvalve comprising a valve and casingthere-for hav'- ing a main chamber within which said valve.reciprocates, an exhaust pipe leading from said chamber and adaptedtobe opened and closed by said valve, an open feed pipe lead? ing"` from'said' chamber, and a series of service pipes of varying pressures thatdischarge directly'into the chamber, the port of the low pressureservice pipe only being opened and closed by said valve.v

3. An' automatic pressure controlling valve l comprising avalve andcasing therefor having a main chamber within which said valvereciprocates, 'Ian exhaust pipe leading from said Chamberland adapted tobe opened and closed by 'said valve, an open lfeedpipe leading from thesaid chamber, and a series of pressureservice pipes of varyingvpressures that discharge directly into said cham- Opened, and theportsV of all of said service pipes adaptedl to. be opened successivelywhen said'exhaust lpipe is closed.

4. An automatic pressure.controlling-valve comprising a valve andcasingtherefor having a'main chamber Within which said valverreciprocates, `an exhaust pipe leading fromi saidchamber; and a/daptedto be opened and closed by said valve, an openfeed pipe leading fromsaid chamber, a-series of service pipes of varying pressures thatdischarge Edif rectly into said chamber and are adapted to be openedsuccessively tothe same lcommenc- -ing With the loW pressure servicepipe, the

port of but one of'said service pipes being closed whensaid exhaust pipeis opened and the ports of all of said service pipesadapted to be openedwhen said exhaust pipe is closed. f

5. 'An automatic pressure controlling valve comprising a ,singlelongitudinally reciprocable valve and a casing therefor having a mainchamberwithin which said lvalve reciprocates, an exhaust/,pipe leadingfrom said chamber-and adapted to be opened and closedy by) said valve,an open feed pipe leading from said chamber, and a series of separatepressure service pipes adapted to discharge directly into said chamber,and separate Ivalves for'said pipes that are automaticallyopenedsuccessively bythe pressure from-*the preceding pressure servicepipe.

An automatic pressure controlling valve comprising a -valve anda casingtherefor havinga main chamber Within which said valve lreciprocates, anexhaust pipe leading from said chamber and adapted to beopened and"closed by saidvalve, an open feed pipe leading' ifrom saidchamberpa'nd/a1series of pressure service pipes of varying pressuresthat dischargedirectly into said vmain cham-' ber, the port of but one of which iSclosed when said exhaust pipe vis open the dls- 1 charge from the otherports being controlled by an individual; valve Within the same, and theports of all of said service pipesadapt;`

ed to be opened when said exhaust pipe'isI closed. f

-7. 'An automatic pressure controlling valve comprising a sliding valve,the cent1al ,por-

tion of which is reduced in diameter, a suit able casing therefor, anexhaust-:pipeat Vone end of said casing, a feed-pipe leading from ltheportion of' the casing traversed by the reduced part of said valve, aseries of servsaid valve When'thegexhaust iso e'n, andl vice versa, andthe inlet vports o `the reiceipes of varying pressures, the inlet 4portof he lovt pressure pipe being -closed by maining pipes being alwaysopen to said casin.- .u 8. in automatic pressure controllmg valvecomprising a sliding valve, the central pori tion of which is reduced indiameter, a suitable casingtherefor, a feed-pipe leading from theportionv of the casing traversed by the reduced part of'said valve, aseries of 'valve-controlled service-pipes of varying pressures, theinlet port of the lovs7 pressure pipe being closed by said valve whenthe exhaust is opened, and vice versa, and the inlet ports of theremaining pipes being al- Ways opento said casing.

9. An automatic pressure controlling valve `comprising a sliding valve,the central portion of which is reduced in diameter, a suitable casingtherefor, a feed pipe leading from the portion of thec'asing traversedby the reduced part of said valve, a series of service-pipes ofevaryingpressures, the inlet port of the low pressure pipe' being lclosedby-said valve .whenthe exhaust 1s open, and vice versa, and the inletports of the remainingpipes being always open to said casing, and valves1n said service-pipes which, after the low pressure service-pipe isopened, are consecutivelyl opened bythe pressure Vfrom ythe pipe next inpressure below it when the resistance to the latter is greater than itspressure. Y l i 10. In an automatic pressure controlling valve, amaster-valve, a suitable casing hav' ,ing a mainchamber within whichsaid master valve reciprocates, an exhaust pipe leading from one end ofsaid chamber, a low pressure service-pipe, discharging directly into the'opposite end of said chamber and 100 adapted'to be alternately openedand closed by said valve, service-pipes of varying pressure greater thansaid low pressure pipe, the discharge ports of which are always open to;the valve-chamber, valve mechanism in said. 105

greater pressure pipes, the area of the surface of said valvemechanism-exposed to the pressure from themasterfvalv'e chamber be#inggrea'ter-than that exposed to the pressure yof the service-pipes.

'110 11. In an'automatic pressure controlling i valve, a master valve, asuitable casin hav-fI ing a main chamberl within which sai mas# tervalve reciprocates an exhaust pipe lead-4 ing from one end o saidchamber, a low pressure pipe discharging directly into the opposite endof said chamber and adapted to 4be Aalternately opened Yand closed bysaid valve, service-pipes' of varying pressures greater than said lowpressure pipe thedis- 12o ycharge ports of which are always open to thechamber ofthe aforesaid valve, .valve mechanism in said greaterpressure'pipes, and springs. for-'closing said valve-mecha# nism.- A 12512. In an automatic-pressure controlling valve, a valve, a suitablecasing having a main'c'hamber within which said valve reciprocates, anexhaust' ipe leading from one lend of said chamber,' a ow' pressure pipedis- 130 charging directly into ithe opposite end" of said chamber'andadapted to be alternatelyl opened and closed by said valve, serviceppesof varying pressures greater than said' low -pressure Vpipe thedischarge ports of,

which are always open to the chamber of the aforesaid valve, valves insaid greater pressure pipes having spindles extending out of the casingcontaining the same, coiled' springs engaging the same, and gage-screwstherefor. f y

13. In an automatic pressure controlling valve, a valvefa suitablecasing having a .main chamber within which said valve reports of'whichare always opento the valve-- ciprocates, an exhaust pipe' leading fromone end of said chamber, a low pressure servicepipe,l dischargindirectly into the opposite end of said cham er and adapted to-bealternately opened and closed by y'said valve, service-pipes of varyingpressure greater than said low pressure pipe, thedischarge chamber,-valves in said greater pressurepipes, automatically returnable valvesfor regulating-the resistance thereof to the pres' surein' said chamber,hollow pistons having piston-heads for-said pistons.

one' end bearing against the heads of said valves and having openingstherein,- and 14. In an automatic pressure controlling valve, avalve, allow pressurepipe adapted to be alternately opened and .closed by saidvalve, service-pipes of varying pressures greater than said low pressurepipe, the discharge ports of which are always open to the v'chamber ofthe aforesaid valve, valves in said greater pressure pipes havingspindles,

' pressure in said chamber, a hollow piston having one vend providedwith lateral openings Band bearing against the heads of saidl valves, apuppet valve for the opposite end of said piston, and piston-heads for`Y,the same. 16. In an' automatic pressure controlling valve, a valve, alow pressure pipe adapted to be alternately opened and `closed by saidYvarying pressure valve, service-pipes of greater than said low'pressure/pipe, the discharge ports of which `are always open to thechamber of the aforesaid valve, valves in ends of said said greaterpressurelpipes having spindles I extending o ut of the casing containingthe same, springs, means regulating the pressure thereof against said'spindle, a hollow piston having one end provided with lateral 7oopenings and bearing against the heads of said valves, ypuppet valves inthe opposite pistons, and piston-heads for said pistons.

, 17. In an automatic pressure controlling valve, a sliding valve, asuitable .casing having a main chamber within which said -valvereciprocates, an exhaust pipe leading from one end of said chamber, alow opposite end `of`said chamber and the dis-- 'charge port of which isadapted to be alternately r opened and closed by said valve, valvecontrolled service-pipes of varying pressures Vgreater than said lowpressure 85 pipe, the discharge ports of which are always open to thechamber of the aforesaid valve, a combined valve-seat-and cage, and avalve confined therein, which valve-'seat and 'valve are inclosed Within.the discharge 90 fchamber of said low pressure serv1ce-p1pe.

18. In anY automatic pressure controlling valve, a sliding valve, asuitable casing having a main' chamber within which said valvereciprocates,/"an exhaust pipe leadlng from one end of 4said chamber, alow-pressure service-pipe, discharging directly into the opposite endofi-:said chamber and the dischargeport' of which is adapted to bealterressure f 4service-pipe, discharging directlyA lnto the-80 natelyopened and closed by said valve,l00

valve controlled service-pipes of varying` pressures greater than saidlow-pressure pipe, the discharge ports of which are always open to thechamber of the aforesaid valve, a combinedrvalve-seat and cage havv ingperforated sides, and a valve lconfined therein, which valve-seat andValve are inclosed within the discharge chamber of said. lowpressureservice-pipe.

19. In an automatlc pressure controlling 11@ valve, a'sliding valve, asuitable casing having a main chamber within which said valvereciprocates,.an exhaust pipe leading 'from one end 'of said chamber, alow-pressure service-pipe, discharging directly into. the

opposite endof said chamber and the discharge port of which is adaptedtobe' alternately opened and closed by said valve, valve controlledservice-pipes of varying pressures greater than said low-pressure pipe,the discharge-ports of which are-always open. to the chamber of theaforesaid valve, -a combined valve-seat and cage, a valve andv springfor holding it on its 'seat confined therein, which valve-seat and valveare inclosed within'the discharge chamber of said' low 4pressureservice-pipe.

20. In an automatic pressure controlling valve, a sliding valve, asuitable casing having a main chamber within which valve i reciprocates,an exhaust pipe'leading from one end of said chamber, a low pressureservice pipe discharging directly into the opposite end of saidI chamberand 'the dischar e port of which is adapted to be alternate y closed andopened by said sliding valve,- independent valve-controlled servicepipes 'of varying pressures greater than said low pressure pipe, thedischarge ports of Vwhich are always open to the chamber of the slidinvalve, a cage in the .valve chamber of said low pressure pipe, a plateclosing the upper end thereof, a low pressure ya'lve', and a springwithin said cage interposed between said-low pressure valve and saidplate.

21. An automatic pressure fcontrolling valve comprising a sliding valve,the central portion of which is reduced in diameter, a suitable casingtherefor, an exhaust-pipe at one endof said casing, a feed-pipe leadingfrom the portion of the 'casing traversed 'by the reduced part of saidvalve,.a series of service-pipes of varying pressures, the inlet port ofthe low-pressure pipe being closed by said valve when the exhaust isopen, and vice versa, and the inlet ports of vthe remaining pipes beingalways open to said casing, and a piston and cylinder therefor forsliding said valve.

22. ln an automatic pressure controlling valve, a sliding valve, alow-pressure service-pipe, the discharge port of which is adapted to bealternately opened and closed i 3 by said valve, valve controlledservice-pipes of varying pressures greater than said lowpressure pipe,the discharge ports of which are always open to the chamber of theaforesaid valve, means. for regulating the resistance thereof to the.ressure in the chamber of' the aforesaid va ve, a combined valveseat andcage, and a valve confined therein,

within the discharge chamber of said lowpressure service-pipe. l

.23. In an automatic pressure controlling valve, a slidingfvalve,`alow-pressure service-pipe, the discharge port of'. which is adapted tobe alternatelyv opened and closed by said valve, valve-controlledservice-pipes of varying pressures greater than said lowpres'sure pipe,thedischarge ports of which are always open to the chamber of theaforesaid valve, valves in said greater pressure pipes having spindlesextending out of the casing containing the same, springs, and means forregulating the pressure thereof against said spindles, a combinedvalve-seat and cage, and a valve confined therein, which valve-seal'land valve are inclosed within the discharge chamber ofsaid low pressureservice-pipe.

24. An automatic pressure controlling valve, comprising a singlelongitudinally reciprocable valve and a casingtherefor having a mainchamber within which said valve reciprocates, an exhaust pipe leadingfrom said chamber and adapted to be opened and closed by said valve, anopen feed pipe leading from said chamber, a series of separate pressureservice pipes adapted to discharge directly into said chamber, separatevalves for said pipes that are automatically opened successively by thepressure from the preceding pressure service pipe, and a piston andcylinder therefor for sliding said valve.

ln witness whereof I have hereunto set my hand this 524th day ofDecember 1909.

' WILLIAM P. BETTENDORF.

Witnesses:

A. B. FRENIER, A. K. READING.

lwhich valve-seat and valve are inclosed

